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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 17, Iss. 10 — Oct. 1, 2000
  • pp: 1880–1886

Optical waveguide absorption sensor using a single coupling prism

Takayuki Okamoto, Mari Yamamoto, and Ichirou Yamaguchi  »View Author Affiliations

JOSA A, Vol. 17, Issue 10, pp. 1880-1886 (2000)

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We propose an optical waveguide sensor that uses a leaky guided mode for measuring absorption of liquid samples. The sensor is composed of a single coupling prism on which a cladding layer and a waveguide layer are deposited. The guided mode generates dips in the reflectance spectrum; the depths of the dips depend on the extinction coefficient of a sample facing the layer. The sensitivity of the sensor is controlled by the thickness of the cladding layer. A simple theoretical model has been developed to analyze the behaviors of the sensor. In experiments we obtained sensitivity 17 times higher than that obtained by the conventional attenuated total reflection method.

© 2000 Optical Society of America

OCIS Codes
(120.5700) Instrumentation, measurement, and metrology : Reflection
(230.7370) Optical devices : Waveguides
(300.1030) Spectroscopy : Absorption
(310.2790) Thin films : Guided waves

Original Manuscript: November 29, 1999
Revised Manuscript: May 15, 2000
Manuscript Accepted: May 15, 2000
Published: October 1, 2000

Takayuki Okamoto, Mari Yamamoto, and Ichirou Yamaguchi, "Optical waveguide absorption sensor using a single coupling prism," J. Opt. Soc. Am. A 17, 1880-1886 (2000)

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